I proudly announce the existence of a newly written software for web-based experiments at the University of Göttingen: http://onexp.textstrukturen.uni-goettingen.de

Here is a new paper about the algebraic foundations for a semantics of questions (and inquisitive content more generally):

https://sites.google.com/site/inquisitivesemantics/documents/synthese2012-inquisitive-algebra-revised.pdf